Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef1c88e32750b69…

MALICIOUS

PDF

89.0 KB Created: 2021-06-25 19:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31d0e286d06f592df82cbec492e3b75e SHA-1: b259e3454fa834fe692b2da27050ec39df7c3326 SHA-256: fef1c88e32750b6907d82a24f7b8e74e95039ed668340a7dbde6c999cebc03f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as download locations for other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these linked resources. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings and URL analysis confirm a pattern of hosting malicious content on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=busty+old+granny+pics
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/9ikinvbis1dsk3k32m4bgvpesa/geluwogik.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ced3ae94fb---sekiwumizidofewoxiz.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5257527c---tudesaturibojivubogikog.pdf
    • http://cdmatik.com/uploads/file/lazomun.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/62d51350909cc20f26f00fa4c93ba5f6/vejamesobupe.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ajp76d5n3op7qs73p1jf10un0s/jajopijuxa.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e69c270414---59757579906.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1675f82216---76845359524.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b94d1127cb2---18055179021.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/aen8r092s8dp8ig154dbftrque/luduzafubopidewerofixapa.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa7eac282f---88047632718.pdf
    • http://ed-web.cz/userfilesfile/ziworaguw.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc03243ad9---64828462127.pdf
    • https://mangonebike.com/uploads/file/874787214.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d241c119ea---jumalefojifoxujuremituri.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3426d532f---66130198366.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/a2af442be1be26d973a01187eb4a7e60/vulogewatesavopuvaxe.pdf
    • http://amctop.com/board_data/editor_img/file/202105190655.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608153ba71c8a---nufivaxajikurajulo.pdf
    • https://laser123.com/geektic/files/7666721942.pdf
    • http://daindnc.com/fckeditor/userfiles/file/lonarukugimokozaraz.pdf
    • http://casaalu.com/luutru/files/tamipi.pdf
    • http://travelport.pl/userfiles//file/mekefufebeloxufusi.pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e9650d042982ee553457bf728d54ee25/mofopumupalizojuge.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d9.bin
bc41eab0e157de16f70ba7e47fe81c53249b5c2073daf297dfa76ae61f56e37b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 17544 bytes
font_01_sfnt_off0001259b.bin
951b061a94c87f2b5a787e415a0c3a69cb2076c4ec017f984584677240c398fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1259B 10824 bytes
font_02_sfnt_off00013e8f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8F 16792 bytes

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